18331849013 has 2 divisors, whose sum is σ = 18331849014. Its totient is φ = 18331849012.

The previous prime is 18331848989. The next prime is 18331849043. The reversal of 18331849013 is 31094813381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14347967089 + 3983881924 = 119783^2 + 63118^2 .

It is an emirp because it is prime and its reverse (31094813381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18331849013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18331849043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9165924506 + 9165924507.

It is an arithmetic number, because the mean of its divisors is an integer number (9165924507).

Almost surely, 2^18331849013 is an apocalyptic number.

It is an amenable number.

18331849013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18331849013 is an equidigital number, since it uses as much as digits as its factorization.

18331849013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 18331849013 in words is "eighteen billion, three hundred thirty-one million, eight hundred forty-nine thousand, thirteen".